Electrical control mechanism



July 21, 1931. KLOTZ 1,815,152

ELECTRI CAL CONTROL'; MECHANI SM Filed Marc 2, 1929 Patented July 2l, 1931 PATENT OFFICE HEINRICH KLOTZ, F WHEELING, WEST VIRGINIA ELECTRICAL CONTROL MECHANISM AppIication failed March 2, 1929. Serial No. 343,995.

This invention relates to power operated presses of the stamping or forming type, and has for one of the principal objects the provision of extremely simple and highly `effective means of operation which permitsthe maximum amount ottwork with the minimum amount of efort on the part of the operator.

A further object of my present invention resides in a circuit with its associated mechanism for permitting the press to descend upon the work but a single time with each depression of the control switch. A still further obj ect of my invention resides in the combination of the elements which may be readily applied to existing punchl presses of various designs in a comparatively short time and after they have been placed in their operative position on the press they may be adjusted inthe minimum amount of time.

The inventive idea involved is capable of receiving a variety of mechanical expressions, some of which for the purpose of illustration are shown in the accompanying drawings, but is it to be expressly understood that such drawings are for the purpose of illustration only andare not designed to define the limits of the invention, reference being had to the appended claims for this purpose.

In the drawing:

Figure 1 is a side elevation of a punch press, illustrated somewhat diagrammatically showing one embodiment of my invention as applied thereto;

Figure 2 is a wiring diagram thereot1 and Figure 3 is a similar View but illustrating another embodiment of my invention.

My invention, in the form or embodiment 4 shown in the drawing and briefly described, comprises a main solenoid, 10, an auxiliary solenoid, 11, a manually operated switch, 12, *and a mechanically operated electrical closing device or switch, 13. The punch press which is indicated generally as at 14, may be of any well known type and is, of course, provided with the usual operating shaft, 15, for impartingv reciprocating movement to the punch indicated as at 16. In applying my invention to a press of the usual type, I merely remove the ordinary foot operating mechanism and secure to the pivotally mounted link, 17, the arm, 18, through the medium of the adjustable link, 19. The arm, 18, is pivoted to a suitable lug, 20, which is carried by any convenient form of casing or housing, 21, secured to the side of the press in any Adesired manner. The casing, 21, is formed so as to conveniently house the solenoids, 10 and 11, together with their associated operating elements, as will be hereinafter more fully described.

The shaft 15 is provided on its periphery with a rounded lug or projection 22 for thc purpose of contacting with the switch 13 after the press has been put into operation.

Referring now particularly to Figure 2 of the accompanying drawings, thc main leads are indicated as at 23 and 24. Assuming that the manually operated switch 12 has been depressed for setting the punch in operation and'assuming that the lead 23 is the positive wire, the current will iow through the switch 12 into the lead 25, passing through the switch arm 26 through the main solenoid Il() and through the lead 27 into the metallic plate 28 through the medium of the contact 29. The current now flows across the plate into the wire 30, through the medium of its contact 31 from. which point it returns to the negative side ot' the line 24. This action forces the core 10' of the solenoid 10, downwardly into the solenoid 'and has effectually ,released the usual clutch (not shown) of the punch press throughl the medium of the arm 18, the link and arm 17 together with the connecting rod 17. The punch press has now been in motion and since it is highly desirable that it rotate but one revolution, reference is made to the following and further description.

It may be here stated that thc core 10. is'well into its solenoid 10, o-r sufficient to effectually operate the clutch of the press, as the pin 18 causes the disengagement of the arm 26 from the terminal contact 25', and thereby severing the main current from the solenoid 10. At this time, the current passes from the lead 25 through the shunt 43 to the solenoid 10. 0bviously, but a small fraction of the current from the main line is utilized when it liows through the shunt 43.

The lug or projection 22 during its rotative movement depresses the pivotally mounted arm 13 sufficiently to make electrical connection between the upper end 32 of the arm 13 and the contact terminal 33 against the tension of the spring 34. The brief moment of cont-act between the end 32 of the arm 13 and the Contact 33 is, of course, sullieient to cause the low of current from the main lead 23 into the lead 36 which terminates at the hub arm 13. The current now continues through the end 32 of the arm 13 and into the lead 37, passing through the auxiliary solenoid 11 and returns to the negative side of the line 24 through the me.- dium of the short lead 38. This action causes the drawing-in of the core 11 into its respective solenoid 11, and by reason of the fact that the metallic plate 28 is carried by the core 11', electrical contact is severed between the plate 28 and the contact terminals 29 and 31 against the tension of the spring 39 and breaks the main circuit with respect to the solenoid 10.

Should the o-perator neglect to release the switch 12, as for example, by failure to remove his foot therefrom, the following action occurs: Current continues to How from the main lead 23 through the switch 12, thence through the lead 40 to the terminal contact 41. From this point, it continues across the metallic plate 28, which is now in its lowered position and into the contact terminal 42, continuing to energize the solenoid 1l and to i'low into the return lead 24 through the medium of the short lead 38. This action continues until the operator releases the manually operated switch 12.

When the switch 12 ,is released, the solenoid 11 is, of course, deenergized and pernuts the return of the metallic plate 28 to the contacts 29 and 31. The entire circuit is now open and the machine is ready for its repeated operation.

In the embodiment of my invention illustrated in Figure 3, I employ an electromagnet44 and a pivotally mounted arm or armature 44 whose free end is arranged to be operated from the lug 22 of the shaft 15. In this form of my invention, when the switch 12 has been closed, the current will flow from the lead 23 into the solenoid 10 through the lmedium of the lead 45, energizing this solenoid, the current returning to the main lead 24 through the medium of the arm 26, the lead 46, the contact terminals 47 and 49 through the medium of. the metallic plate 48 and the return lead 50. This action, as in the4 form of my invention already described, causes the core 10 to be drawn within the solenoid 10 and the downasienta ward movement of the arm 18 depresses the switch arm 26 and permits the flow of current into the solenoid 10 through the medium of the shunt 43.

The shaft 15 is now released through the medium of the clutch (not shown) and iscaused to rotate in the direction shown by the dotted arrow. lliThen the lug 22 contacts with the free end of the arm 44, the metallic plate 48 is moved away-from the contact terminals 47 and 49 and causes the plate to form an electrical connection with respect to the terminals 53 and 54. Assuming, of course, that the switch 12 is still closed, the current from the lead 23 passes through the magnet 44 through the medium of the lead 51 and leaving the magnet through the lead 52. The current now continues from the lead 53 through the metallic plate 48 into the terminal 54, `from which. point it is directed to the lead 50 and back into the negative line 24.

As described in the previous embodiment of my invention, the several parts retain this position until the switch 12 has been released, at which time the various details will, of course, return to their initial position and be in readiness for its further operation.

F rom the above description, it will be readily understood that this device will be effective in operation, continuously used at a very low up-keep with the minimum amount of lire hazards, -due to the reduction of the intensity of the current, and one which will require practically no adjustments after its installation.

I claim Clutch operating mechanism comprising a lever pivotally mounted, a solenoid llaving a coro engaged with said lever to move the lever in one direction when the solenoid is energized, an energizing circuit for said solenoid including a switch yieldingly held closed and disposed for engagement by said lever whereby the switch will be opened when the solenoid is energized, a manually controlled switchA for closing said circuit, a shunt in said circuit paralleling the first switch for passage of current to the solenoid 'when the switch is opened, a bridge in said circuit yieldably held closed, an auxiliary solenoid for moving the bridge to an open position when energized, an auxiliary circuit, for the auxiliary solenoid cut into the rst circuit having spaced contacts bridged by said bridge when the bridge is moved to vbreak the circuit through the first solenoid, and a switch for the auxiliary circuit yieldably held open and adapted to be closed when engaged by a portion of a rotating shaft of a machine.

In testimony whereof I hereunto affix my signature.

HEINRICH KLOTZ. 

